/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.commons.utils;

import org.apache.iotdb.commons.file.SystemFileFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.nio.file.DirectoryNotEmptyException;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.util.Arrays;
import java.util.Objects;

public class FileUtils {
    private static final Logger logger = LoggerFactory.getLogger(FileUtils.class);

    private static final int bufferSize = 1024;

    private FileUtils() {
    }

    public static void deleteDirectory(File folder) {
        if (folder.isDirectory()) {
            for (File file : folder.listFiles()) {
                deleteDirectory(file);
            }
        }
        try {
            Files.delete(folder.toPath());
        } catch (NoSuchFileException | DirectoryNotEmptyException e) {
            logger.warn("{}: {}", e.getMessage(), Arrays.toString(folder.list()), e);
        } catch (Exception e) {
            logger.warn("{}: {}", e.getMessage(), folder.getName(), e);
        }
    }

    public static void deleteDirectoryAndEmptyParent(File folder) {
        deleteDirectory(folder);
        final File parentFolder = folder.getParentFile();
        if (parentFolder.isDirectory()
                && Objects.requireNonNull(parentFolder.listFiles()).length == 0) {
            if (!parentFolder.delete()) {
                logger.warn("Delete folder failed: {}", parentFolder.getAbsolutePath());
            }
        }
    }

    public static boolean copyDir(File sourceDir, File targetDir) throws IOException {
        if (!sourceDir.exists() || !sourceDir.isDirectory()) {
            logger.error(
                    "Failed to copy folder, because source folder [{}] doesn't exist.",
                    sourceDir.getAbsolutePath());
            return false;
        }
        if (!targetDir.exists()) {
            if (!targetDir.mkdirs()) {
                logger.error(
                        "Failed to copy folder, because failed to create target folder[{}].",
                        targetDir.getAbsolutePath());
                return false;
            }
        } else if (!targetDir.isDirectory()) {
            logger.error(
                    "Failed to copy folder, because target folder [{}] already exist.",
                    targetDir.getAbsolutePath());
            return false;
        }
        File[] files = sourceDir.listFiles();
        if (files == null || files.length == 0) {
            return true;
        }
        boolean result = true;
        for (File file : files) {
            if (!file.exists()) {
                continue;
            }
            File targetFile = new File(targetDir, file.getName());
            if (file.isDirectory()) {
                result &= copyDir(file.getAbsoluteFile(), targetFile);
            } else {
                // copy file
                try (BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
                     BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(targetFile))) {
                    byte[] bytes = new byte[bufferSize];
                    int size = 0;
                    while ((size = in.read(bytes)) > 0) {
                        out.write(bytes, 0, size);
                    }
                }
            }
        }
        return result;
    }

    /**
     * Calculate the directory size including sub dir.
     *
     * @param path
     * @return
     */
    public static long getDirSize(String path) {
        long sum = 0;
        File file = SystemFileFactory.INSTANCE.getFile(path);
        if (file.isDirectory()) {
            String[] list = file.list();
            for (String item : list) {
                String subPath = path + File.separator + item;
                sum += getDirSize(subPath);
            }
        } else {
            // this is a file.
            sum += file.length();
        }
        return sum;
    }

    public static void recursiveDeleteFolder(String path) throws IOException {
        File file = new File(path);
        if (file.isDirectory()) {
            File[] files = file.listFiles();
            if (files == null || files.length == 0) {
                org.apache.commons.io.FileUtils.deleteDirectory(file);
            } else {
                for (File f : files) {
                    recursiveDeleteFolder(f.getAbsolutePath());
                }
                org.apache.commons.io.FileUtils.deleteDirectory(file);
            }
        } else {
            org.apache.commons.io.FileUtils.delete(file);
        }
    }
}
